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Contact Book vs Monica (Personal CRM): the honest comparison

Two products with the same goal, two different shapes. Here's where each one wins, where it doesn't, and how to pick.

Personal CRM
Open source
Julia Yukovich
Julia YukovichCo-Founder + CEO
·February 27, 2026·
2 min read

At a glance

Monica is the elder statesman of the personal-CRM space - mature, open-source, and self-hostable. Contact Book is younger and lighter, with a sharper UI, live multi-tab updates, and a deliberately small surface. If you want to self-host on a Pi and tinker, Monica is hard to beat. If you want a clean, fast personal CRM that you don't run yourself, with bilingual support and a hosted plan that costs less than two coffees a month, that's us.

Contact Book vs Monica: feature comparison

When to pick which

Pick Contact Book when

You want a hosted product that's clean, fast, and bilingual out of the box.
Live multi-tab updates matter - you keep two tabs open and want the second to react to the first.
You'd like an MCP server + drop-in clients in 15 languages so AI agents can use the same product you do.
EU jurisdiction, but specifically Germany under German law.

Pick Monica when

You want to self-host on your own box and skim the source.
Open-source on principle - you only adopt tools you can fork.
You like Monica's heavy, journal-style UI and want every preference dial it ships.

Same goal, different shape

Both products want to give you a single calm place to keep the people in your life. Monica gets there with a comprehensive feature surface accumulated over years of community contribution. Contact Book gets there with a sharper, more opinionated subset and a fast UI on top.

The honest take: if you tested both and only had ten minutes per app, you'd probably feel us as faster and Monica as more configurable. Pick whichever feeling matters more.

Hosting + jurisdiction

Monica's hosted plan runs in France under EU law. Ours runs in Germany under German law. For most users this is academic - the EU GDPR baseline is the same. If you have a corporate or legal requirement specifically pointing at Germany, that's a clear win for us. If you don't, treat the two as equivalent on this axis and pick on UX.

Try Contact Book

Free plan, no credit card. We host in Germany. You can export and delete everything self-serve.

Julia Yukovich

Written by

Julia Yukovich

Co-Founder + CEO

Julia is one of the Co-Founders. She handles design, product direction, and most of the support replies that arrive in the morning.

julia.yukovich at aicuflow dot comLinkedIn